Attachment to electric insulation



April 12, 1927.

A. HADDOCK ATTACHMENT T0 ELECTRIC INSULATION Filed June 5, 1922 am\u Mg /nven for: Arfhur fiflddUC/f,

by L W w Patented Apr. 12, 1927.

UNITED'S'TATES PATENT omen.

ARTHUR HADDOCK, or. alter ORANGE, new JERSEY, a smme To WESTERN amicrue COMPANY, INCORPORATED, or new YOR 1v. Y., A CORPORATION or NEW YORK.

Application filed June 3,

element to material which is to some extent mechanically weak.

One of the objects of the invention is to provide means for attaching hinges or other elements subject to strain to electric insulating materials or other materials which are of inadequate strength to withstand ordinary strains on screw threads tapped therein. 'The materials may be weak due to brittleness, due to a laminated structure giving rise to differences in strength in different directions, or due to other reasons.

It is old in the art to employ metal inserts molded into electric insulating material and like materials for the purpose of providing screw threads of greater strength than that of the insulating material within.

which the metal is inserted. This expedient is not available, however, after the insulating or similar material has been made up in final form without the proper inserts.

One object of the present invention is to provide a simple and efficient means of attachment to finished materials, and at the same time substantially conceal the means by which the attachment. is accomplished.

In accordance with the present invention, meansare provided for securely attaching a hinge by means of screws to the edge of a door consisting of a panel of insulating material. A hole is drilled through the door from one side to the other in a direction perpendicular to that to be takenby the screw to be associated therewith. A cylindrical plug of brass or other suitable material is inserted to closely fit said hole and to entirely close an exposed end of the hole. Screw threads are then tapped from the edge of the door and extended into said plug. The hinge may now be firmly attached to the edge of the door. by means of a'screw threaded into said plug. The plug takes up any severe strains to which the hinge may be subjected and at tl'icusametime closes the exposed end of the plug hole at the front of the door, thus concealing from view the details of construction and presenting a finished appearance to the door. The plug may be provided with an expanded head to extend over the edges of the plug ATTACHMENT To nLncTRIc INSULATION.

1922. Serial N0. 565.666.

hole, thus adding to the ornamental appearance of the construction and further conbe provided in the manner just described.

Otherobjects of the invention will be'apparent trom the more detailed description of thedrawings.

Fig. 1 is a cross sectional view of'a modification of the invention showing means for attaching a hinge to insulating material by means of screws; F ig. 2 illustrates a door having a' hinge attached thereto in accordance with the construction shown in Fig. 1; Fig. 3 is a partial sectional view'ot the door shown in Fig. 2 taken along, the line 33. looking in the direction indicated by the arrows. Referring to Fig. 1, the body 1 of electric insulating material consisting of phenol fibre or other phenol product, or other material which is of inadequate strength to withstand ordinary strains on screw threads tapped therein, is provided with a cylindrical hole 2 which passes through the body 1 at right angles to the direction to be taken by the screw 3. The cylindrical plug 4 of brass or other suitable material is fitted t ghtly into the hole 2 so thatit closely fills the end otthe hole 2 at the exposed surface 5 ot' the body 1. A hole is then drilled from the edge 6 of the body 1 and tapped through the body 1 and the plug 4. The hinge member or other element? is firmly attached to the edge 6 of the body 1 by means of the flat headed machine screw 3.

hen the hinge. member 7 is subjected to a force tending to detach it from the body 1, the screw 3 resists said force to a much greater degree than would be possible it thcscrew 3 were threaded merely into'the body 1. The plug 4: not only furnishes a screw thread'of much greater strength than that of the phenol fibre of which the body 1 may be composed, but distributes the force exerted by the screw 3 over a larger portion of the body 1 than would be possible if the screw 3 were threaded into the body 1 alone.

It is not necessary to provide threads in the body 1, and a clearance hole between the edge (3 and the plug at may be used instead of a tapped hole, although the threadof the invention which follows and inview fit) rality oi plugs -11 are prorided to permit 01 panel.

ed hole in the body 1 provides a more rigid and satisfactory means for engaging the screw 3. The head 8 oil the plug" +l may be expanded to extend over the exposed snrface 5 ot the body 1 and cover up the edge ot the exposed end oi" the hole 2. Plan l is shown with a rounded head but itvious that anv other suitable form of ornamental head ma be provided on the. pine; d. This head tlaeilitiates the assembly of the plug 1 in the body 1 as it provides a detinitc stop to determine how :lar the plug at to be inserted within the hole 2 from the exposed surface 5. if desired, the hole needonl v extend part way through the body 1 and in this case, only one end of the hole is exposed at the surl'a| :e oi? the body 1. t Fig. shows a door it) of a switchboard panel composed of phenol libre or similar material. The hinge i1 is attached to the door 10 by the same type oi construction described in eoi'inia-tion with Fig.1. 1. A. plusecuring the hinge to the door 10 at a pinrality o 1 p eint-s.

Fig. 2-} shows the method ot applying the construction illustrated in Fig. 1 to the door 10. The hinge member T is supported by the eonipleinentary member 12 which in terial which covered by and reinforces the insulating panel 20.

. \lthou,e'h the invention has been dc scribed in connection with means tor atinching a hinge to a. body oti insulating material, it is to be understood that other elements than hinges may be attached in the manner (inscribed not only to the edge of a bod but to any desired part of the body.

It will be obvious that the general prinriples herein disclosed maybe embodied in many other arrangements widely diiterent from those illustrated without departing from the invention as defined in the appended claims.

lVhat is claimed is: a r

.1. In combination, a body having an edge, said body being coini'iosed of material too weak to withstand a substantial strain on screw threads therein, an element attached to said edge, and means, including a circular plug" having an expanded head completely lilting an exposed end of a hole in said body, and a screw threaded into said plug at a substantial angle to the axis oi said plug iior clamping saidelement: against said edge.

2. In combination, a body of electric insulating material, an element supported by said material, means comprisi11g; a circular in; having an expanded head for reen'foreinnsaid insulating material at the point of support and a screw for attaching said element to said insulatingmaterial, said screw being threaded both tosaid log and to said insulatiru material;

3.1'n combination, a body having an edge, the material oi which said body 1s composed being too weak to withstand a substimtial strain on screw threads therein,

an element attached .tod said edge, and means, including a cylindrical plug having an expiuided head in close C(lllttlCllWVlt-ll the euriare ot said body snl'istantii'dl v complete 1 tillinp a cylindrical cavity extending :lron'i one side ot said body to the other} and a screw threaded into said plug substantially t right angles to the axis of said plrnr, said screw having a head for clamp inn said element against said edge. a

In combination, two bodies to be attached together, the material of one of said bodies being characterized by low; tensile strength and elasticity, acylindrical plug having a smooth surface inserted in a hole in one of said members, amember threaded to saidmaterial of low strength and to said plug and adapted to clamp said bodies firmly together, said plug: having ahead adapted to present a reenl'orcing surface to said body oi low strength.

In witness whereof, I hereunto subscribe my name this 2nd, day of June A. D.,l1$l22.

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